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Carburetor restrictor plate with a roots blower?
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DRR Trophy
Picture of Jason Haley
posted
Will running a restrictor plate with a blower hurt anything? I have a few index races this year that I want to run. The car is several tenths too fast with the blower, but will be several tenths too slow without the blower.


Slow S-10
Slower Cutlass
 
Posts: 40 | Location: Smiths Grove, KY | Registered: December 06, 2010Reply With QuoteReport This Post
DRR Sportsman
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Change pulley? Lower timing? I think either would be a better option
 
Posts: 123 | Location: Over here | Registered: November 28, 2007Reply With QuoteReport This Post
DRR Sportsman
Picture of NEMO963
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Never intentionally restricted the inlet side but have changed adapters from more restrictive to less and picked up a decent amount of boost. Some overdrive numbers prefer a smaller opening so depends on the combo. Agree that lowering your overdrive, reducing timing, shifting earlier is probably a better option.


2015 M&M T/D
Nemo
Duty-Pride-Tradition
FTM/PTB
 
Posts: 313 | Location: Firehouse 10 Wichita Ks | Registered: February 15, 2005Reply With QuoteReport This Post
DRR S/Pro
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a good air filter?


J.R. Baxter

""Fathom the hypocrisy of a Government that requires every citizen to prove they are insured ..but not everyone must prove they are a citizen."

2024 Miller
Rolla Competition Engines
ProCharger
Hoosier Tires
Abruzzi
 
Posts: 1529 | Location: Waxahachie | Registered: July 04, 2005Reply With QuoteReport This Post
DRR S/Pro
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slowing the blower would be the best option imo


J.R. Baxter

""Fathom the hypocrisy of a Government that requires every citizen to prove they are insured ..but not everyone must prove they are a citizen."

2024 Miller
Rolla Competition Engines
ProCharger
Hoosier Tires
Abruzzi
 
Posts: 1529 | Location: Waxahachie | Registered: July 04, 2005Reply With QuoteReport This Post
DRR Sportsman
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Could definitely speed it up with a restrictor plate if you aren’t careful. I’ve had two different blower combos that picked up .1 - .2 to the 1/8 by restricting the blower inlet. The first time I was trying to slow that car down. The second time I was actually trying to speed it up and it worked
 
Posts: 934 | Location: my own little world | Registered: July 20, 2005Reply With QuoteReport This Post
DRR Top Comp
Picture of wideopen231
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Agree with those saying just slow the blower. Less boost,less lower air temp and less we33ar on blower.Souynds like win, win and win if wanting less air.




America home of free. Brought to you by 2nd amendment.
 
Posts: 4236 | Location: Greensboro NC | Registered: May 24, 2011Reply With QuoteReport This Post



DRR Pro
Picture of Goob
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quote:
Originally posted by BJs Wild Ride:
Could definitely speed it up with a restrictor plate if you aren’t careful. I’ve had two different blower combos that picked up .1 - .2 to the 1/8 by restricting the blower inlet. The first time I was trying to slow that car down. The second time I was actually trying to speed it up and it worked


That's very interesting.....
Would that indicate that fuel delivery was lacking?


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Dave Cook
N375
 
Posts: 1698 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post
DRR Sportsman
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If you have a fuel deliver issue on blown alky, it doesn’t usually show up as a small change in the time slip. Usually a little more dramatic.

No, roots blowers like airspeed. Just like an intake port. Seems like 500-600 fps is probably ideal. Anything faster and the power will just flatline. Anything below 300-400 and you aren’t filling the rotors completely. The promod guys figured this out a long time ago, but they always talk about opening size vs. OD. Well, that’s because the motors and blowers are all similar size. the real metric is opening size vs. mass airflow through the motor
 
Posts: 934 | Location: my own little world | Registered: July 20, 2005Reply With QuoteReport This Post
DRR Pro
Picture of Goob
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I can get that logic, but the OP indicated it's a carbureted application. I assumed he was talking about an under the carb restrictor.
Don't know. Confused


"Despite the high cost of living, it remains popular."
Dave Cook
N375
 
Posts: 1698 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post
DRR Sportsman
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Basically the same thing I’m talking about. I used a plate inside a hat once and a tiny single throttle body the other time. Will look the same to the blower as a restrictor under a carb
 
Posts: 934 | Location: my own little world | Registered: July 20, 2005Reply With QuoteReport This Post
DRR Trophy
Picture of Jason Haley
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Thank you everyone for the input. I ended up holding almost 4-5 tenths (it was a 1/4 mile race) and unfortunately that didn't work out very well for me.


Slow S-10
Slower Cutlass
 
Posts: 40 | Location: Smiths Grove, KY | Registered: December 06, 2010Reply With QuoteReport This Post
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